Preheat the oven to 350 degrees Fahrenheit. Prepare an 8 inch square baking dish by greasing it and setting it aside.

In a medium-sized bowl, add flour, baking powder, salt, sugar and two tablespoons of cocoa. Mix well. Next, stir in the milk and oil until well blended. Pour the mixture into the pre-prepared baking dish.

In a small bowl, combine the remaining cocoa and brown sugar. Sprinkle this mixture over the batter. Pour the hot water over the top of the batter but do NOT stir. Then place the baking dish into the oven. Bake the cobbler for 45 minutes or until the cake springs back when touched in the center.